$('.cur-user').hover(function(){
    $('.usermsg').show()
},function(){
    $('.usermsg').hide()
})
function getRuntime() {
    let birthday = new Date('2020-4-1').getTime()
    let today = new Date().getTime()
    let runtime = today - birthday
    let runday = parseInt(runtime/1000/24/60/60)
    return runday
}
let runday = getRuntime()
$('#runtime').text(runday)